ATI PHARMACOLOGY NSG 1540 EXAM 3
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Free ATI PHARMACOLOGY NSG 1540 EXAM 3 Questions
A nurse assesses a client receiving rifampin therapy for active TB. Which statement indicates the client understands the medication?
- "This medication will turn my urine green."
- "This medication will increase my appetite."
- "I may experience drooling while taking this medication."
- "I understand I will take the medication for six months."
Explanation
Correct Answer: D) "I understand I will take the medication for six months."
Tuberculosis treatment requires a prolonged course of combination antibiotic therapy — typically a minimum of six months — to fully eradicate Mycobacterium tuberculosis and prevent the development of drug-resistant strains. Understanding and committing to the full duration of therapy is the most critical aspect of TB treatment adherence, as early discontinuation is a leading cause of treatment failure and multidrug-resistant TB. This statement demonstrates the most clinically important understanding of rifampin therapy.
Rifampin causes a well-known harmless discoloration of body fluids — turning them orange-red, not green — so the first statement reflects a misconception. Rifampin commonly causes loss of appetite, nausea, and GI upset rather than increased appetite. Drooling is not an associated side effect of rifampin therapy.
A nurse is assessing a client with a suspected fungal infection. Which cue would indicate the need for a topical antifungal treatment?
- Linear, burrow-like tracks on the skin
- Presence of red, raised, circular rash with clear center
- Small, fluid-filled vesicles clustered in a patch
- Yellow, pus-filled blisters on the skin
Explanation
Correct Answer: B) Presence of red, raised, circular rash with clear center
A red, raised, circular rash with a clear center is the classic presentation of tinea corporis — commonly known as ringworm — a superficial dermatophyte fungal infection of the skin. Despite its name, it is caused by a fungus, not a worm, and is characterized by its distinctive ring-like appearance with an advancing scaly border and central clearing. This presentation directly indicates the need for topical antifungal therapy such as clotrimazole or terbinafine.
Linear, burrow-like tracks on the skin are the hallmark of scabies — a parasitic infestation caused by Sarcoptes scabiei — requiring antiparasitic treatment, not antifungals. Small, clustered fluid-filled vesicles suggest a viral infection such as herpes simplex or varicella, requiring antiviral therapy. Yellow, pus-filled blisters indicate a bacterial infection such as impetigo, which requires antibiotic treatment.
A nurse is caring for a client who is receiving gentamicin. Which of the following findings should the nurse identify as a possible complication?
- Dysuria
- Ototoxicity
- Constipation
- Diplopia
Explanation
Correct Answer: B) Ototoxicity
Gentamicin is an aminoglycoside antibiotic with well-established dose-dependent toxicities, the most serious of which are ototoxicity and nephrotoxicity. Ototoxicity results from damage to the hair cells of the cochlea and vestibular apparatus, presenting as tinnitus, hearing loss, and balance disturbances. Because this damage can be permanent and irreversible, nurses must monitor drug levels, assess hearing regularly, and watch for early warning signs throughout therapy.
Dysuria relates to urinary tract irritation and is not a characteristic complication of gentamicin. Constipation is not associated with aminoglycoside use. Diplopia — double vision — is linked to conditions such as myasthenia gravis or cranial nerve dysfunction, not gentamicin toxicity.
A nurse is teaching a client who is starting to take methotrexate to treat rheumatoid arthritis. Which of the following instructions should the nurse include in the teaching?
- "Drink at least 2 liters of water daily."
- "Take the medication daily."
- "Avoid eating foods high in vitamin K."
- "Use an alcohol-based mouthwash after each meal."
Explanation
Correct Answer: A) "Drink at least 2 liters of water daily."
Methotrexate is a disease-modifying antirheumatic drug (DMARD) that can be nephrotoxic and may cause precipitation of drug crystals in the renal tubules. Adequate hydration of at least 2 liters of water daily helps maintain renal perfusion, promotes excretion of the drug and its metabolites, and reduces the risk of kidney damage and toxicity. Hydration is therefore a key safety instruction for patients on methotrexate therapy.
Methotrexate for rheumatoid arthritis is taken weekly — not daily — as daily dosing significantly increases the risk of severe toxicity including bone marrow suppression and hepatotoxicity. Avoiding foods high in vitamin K is relevant for patients on warfarin, not methotrexate. Alcohol-based mouthwash should be avoided because methotrexate already carries hepatotoxic risk, and alcohol compounds liver damage while also irritating oral mucosa — patients should instead use a gentle, non-alcoholic rinse, especially given that mucositis is a known side effect.
A nurse is reinforcing teaching to a client who is beginning methotrexate therapy for rheumatoid arthritis. Which explanation should the nurse provide about the medication's mechanism of action?
- Methotrexate increases cartilage regeneration
- Methotrexate blocks pain receptors
- Methotrexate suppresses the immune response
- Methotrexate stimulates red blood cell production
Explanation
Correct Answer: C) Methotrexate suppresses the immune response
Methotrexate is a disease-modifying antirheumatic drug (DMARD) that works primarily by inhibiting dihydrofolate reductase, an enzyme essential for DNA synthesis and cell proliferation. In rheumatoid arthritis, this action suppresses the overactive immune response responsible for joint inflammation and destruction by reducing the proliferation of immune cells — particularly lymphocytes — that drive the autoimmune attack on synovial tissue. This immunosuppressive effect slows disease progression and reduces inflammation over time.
Methotrexate does not regenerate cartilage, block pain receptors, or stimulate red blood cell production. In fact, it can suppress bone marrow activity and reduce red blood cell production as an adverse effect, making option D not only incorrect but the opposite of its actual impact on erythropoiesis.
A nurse is caring for a client who has a bloodstream infection caused by a multidrug-resistant organism (MDRO). The nurse is preparing to administer intravenous vancomycin. Which action should the nurse take to reduce the risk of nephrotoxicity?
- Stopping the medication if the client reports nausea or vomiting
- Flushing the intravenous line with 0.9% sodium chloride before and after administration
- Monitoring the client's serum creatinine and blood urea nitrogen (BUN) levels before each dose
- Administering the medication over 15 minutes to reduce infusion-related reactions
Explanation
Correct Answer: C) Monitoring the client's serum creatinine and blood urea nitrogen (BUN) levels before each dose
Vancomycin is a glycopeptide antibiotic with well-documented nephrotoxic potential, particularly when serum levels are excessive or when used alongside other nephrotoxic agents. Monitoring serum creatinine and BUN before each dose allows the nurse to detect early signs of renal impairment — rising levels indicate the kidneys are struggling to clear the drug, necessitating dose adjustment or temporary discontinuation to prevent irreversible kidney damage. Therapeutic drug monitoring of vancomycin trough or AUC levels is also essential in clinical practice.
Nausea and vomiting are not indications to stop vancomycin — they are manageable GI side effects. Flushing the IV line is standard practice for line patency but does not reduce nephrotoxicity. Vancomycin must be infused slowly over at least 60 minutes — not 15 minutes — as rapid infusion causes Red Man Syndrome, a histamine-mediated infusion reaction characterized by flushing, erythema, and hypotension.
A nurse is preparing to administer penicillin G to a client. The client reports a history of a rash after receiving amoxicillin. Which action should the nurse take?
- Ask the client to describe the rash and proceed if it was mild
- Administer the medication and monitor for a reaction
- Document the allergy and give the medication with diphenhydramine
- Notify the provider before administering the medication
Explanation
Correct Answer: D) Notify the provider before administering the medication
Amoxicillin is a penicillin-class antibiotic, and a reported rash following its use may indicate a penicillin allergy. Since penicillin G belongs to the same beta-lactam antibiotic class, cross-reactivity is a significant concern. Before administering any medication from the same drug class to a client with a possible allergic history, the nurse must notify the provider to evaluate the allergy, determine its severity, and decide whether to proceed, substitute an alternative antibiotic, or conduct allergy testing. Patient safety takes priority over proceeding with administration.
Asking about the rash and proceeding based on severity bypasses the required provider consultation and places the patient at risk. Administering the medication and monitoring is unsafe given the potential for cross-reactive anaphylaxis. Giving diphenhydramine prophylactically does not adequately protect against a severe allergic reaction and is not an appropriate independent nursing action in this situation.
A client has been diagnosed with Clostridioides difficile infection after completing a 10-day course of broad-spectrum antibiotics. Which nursing actions are appropriate? (Select all that apply.)
- Place the client on contact precautions
- Encourage the client to increase fluid intake
- Use dedicated equipment (e.g., stethoscope, blood pressure cuff) for this client
- I will take a probiotic supplement during and after the antibiotic course
- Instruct the client to perform hand hygiene using an alcohol-based hand sanitizer
- Administer loperamide to reduce diarrhea
Explanation
Correct Answers: A) Place the client on contact precautions, B) Encourage the client to increase fluid intake, and C) Use dedicated equipment for this client.
C. diff is transmitted via the fecal-oral route through spores, so contact precautions and dedicated equipment are essential to prevent spread. Increasing fluid intake addresses dehydration from diarrhea. Alcohol-based hand sanitizers are ineffective against C. diff spores — soap and water must be used instead, making option E incorrect. Loperamide is contraindicated in C. diff as it slows gut motility and can worsen the infection by retaining toxins. Probiotics (option D) are a patient statement, not a nursing action, and while sometimes discussed adjunctively, they are not a standard approved nursing intervention for active C. diff infection.
A client receiving azathioprine (Imuran) asks why frequent blood tests are required. What is the nurse's best response?
-
"The tests evaluate whether the drug is causing bradycardia."
-
"This medication can cause severe dehydration."
-
"The tests help monitor for kidney stones."
-
"We are checking for bone marrow suppression."
Explanation
Correct Answer: D) "We are checking for bone marrow suppression."
Azathioprine is an immunosuppressant that works by inhibiting purine synthesis, thereby suppressing the proliferation of immune cells. A major and serious adverse effect is bone marrow suppression — leading to leukopenia, thrombocytopenia, and anemia — which significantly increases the patient's risk of life-threatening infections and bleeding. Regular complete blood count (CBC) monitoring is essential to detect early signs of myelosuppression so that the dose can be adjusted or the medication discontinued before severe complications develop.
Azathioprine does not cause bradycardia, severe dehydration, or kidney stones — these are not recognized adverse effects of this medication and therefore do not explain the need for routine blood monitoring.
A nurse is teaching a client about ibuprofen. Which of the following cues should the nurse recognize as a potential complication of ibuprofen?
- Black, tarry stools
- Yellowing of the skin
- Decreased blood pressure
- Increased appetite
Explanation
Correct Answer: A) Black, tarry stools
Black, tarry stools (melena) indicate gastrointestinal bleeding, which is a serious and well-known complication of ibuprofen and other NSAIDs. NSAIDs inhibit prostaglandin synthesis, which normally protects the gastric mucosa, making GI bleeding a significant risk. Yellowing of the skin suggests hepatotoxicity, more commonly associated with acetaminophen overdose. Decreased blood pressure and increased appetite are not recognized complications of ibuprofen use.
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